Hello, got lucky on the weekend discovered a collapsed smoky quartz cavern 300mm from the surface on the NW.The crystals are black some more transparent than others and ranging in size from 10mm x 10mm up to 700mmx150mm unfortunately most are broken or shattered due to the pressures of the earth; but where they have broken it looks like they have started to grow again , is this possible?got many good points up to 150mm wide, a personal best.Any tips on cleaning these up?